Espresso machine



FIG. 1 is a right-hand front perspective view of an espresso machine embodying my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right-hand side elevational view thereof;

FIG. 5 is a left-hand side elevational view thereof;

FIG. 6 is a rear elevational view thereof; and

FIg. 7 is a bottom plan view thereof. 

The ornamental design for an espresso machine, as shown and described. 